OAKLAND (KCBS/AP) - Three people were killed and two others were foced to jump from a second-story window during an early morning fire at an East Oakland apartment complex.

The two-alarm blaze was reported at 1:55 a.m. in the 1700 block of 82nd Avenue, Oakland fire Battalion Chief Eleanor Bolin-Chew said.

Firefighters responded and removed a man, woman and 3-year-old girl from an apartment on the second floor of the building. They were taken to a hospital where they were all pronounced dead, Bolin-Chew said.

Two women in another second-floor apartment had to jump to the ground to escape the fire. They were both injured but are expected to survive, Bolin-Chew said.

KCBS' Janice Wright Reports:

Four other people living at the apartment complex were safely evacuated, she said.

The man who was killed was able to rescue a 7-year-old girl from the apartment where the fire started. He then went back inside to try to rescue the woman and 3-year-old girl, but all three perished in the blaze, Bolin-Chew said.

The woman was the mother of the two girls, while the man appears to have been a family friend, she said.

The cause of the blaze appears to be an extension cord that was part of a network of cords supplying power to the apartment. That apartment had its power shut off by PG&E on Dec. 2, Bolin-Chew said.

The residents had connected a long extension cord to an outlet in a downstairs apartment, Bolin-Chew said. She said investigators do not know whether the downstairs residents were aware of the extension cord.

There were smaller extension cords connected to the large one, and one of the cords apparently caught fire, she said.

There were no smoke detectors in the apartment.

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